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| Effects of iron plaque and phosphorus on the aluminum tolerance of cell walls in rice root tips |
| Received:May 15, 2019 |
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| KeyWord:rice;aluminum toxicity;iron plaque;phosphorus;cell wall polysaccharides |
| Author Name | Affiliation | E-mail | | WANG Zhi-yi | College of Geography and Environment Sciences, Zhejiang Normal University, Jinhua 321004, China | | | LI Wen-jing | College of Geography and Environment Sciences, Zhejiang Normal University, Jinhua 321004, China | | | XING Cheng-hua | College of Agricultural and Biological Engineering, Jinhua Polytechnic, Jinhua 321007, China | | | LI Fang | College of Geography and Environment Sciences, Zhejiang Normal University, Jinhua 321004, China | | | WANG Ya-chao | College of Geography and Environment Sciences, Zhejiang Normal University, Jinhua 321004, China | | | CHEN Chao-fa | College of Geography and Environment Sciences, Zhejiang Normal University, Jinhua 321004, China | | | CAI Miao-zhen | College of Geography and Environment Sciences, Zhejiang Normal University, Jinhua 321004, China | mzcai@zjnu.cn |
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| Abstract: |
| A hydroponic experiment was carried out to investigate the differences in plant growth and cell wall components in the roots of two rice genotypes that differ in terms of Al tolerance when exposed to iron plaque(IP)and phosphorus(0, 15, 30 mg·L-1)treatments. Exposure to 50 μmol·L-1 aluminum(Al)significantly decreased the biomass of roots and shoots, which was accompanied by significant increases in the Al content in the root tips, the cell wall pectin content, and the hemicellulose 1 and hemicellulose 2 contents compared with those of the control. These effects were more pronounced in Hongliangyou 166 than in Feiyouduoxi No.1. Compared with the Al treatment, the IP+Al treatment increased the root dry weight of Feiyouduoxi No.1 and Hongliangyou 166 by 27.7% and 12.3%, decreased the root tip Al content by 15.6% and 33.3%, and reduced the pectin content by 22.6% and 29.9%, respectively. The hemicellulose 1 and hemicellulose 2 contents in the root tips also significantly decreased, while the Fe content on the root surface increased by 434.5% and 265.5% for Feiyouduoxi No.1 and Hongliangyou 166, respectively, suggesting that IP formation alleviated Al-induced plant growth inhibition by decreasing the contents of cell wall pectin, hemicellulose 1 and hemicellulose 2. Accordingly, compared with the IP+Al treatment, the addition of phosphorus significantly decreased the contents of pectin, hemicellulose 1 and hemicellulose 2 in the root tips. Moreover, the relative root length increased, and the Al content decreased in the root tips with the addition of phosphorus, indicating that the effect of phosphorus on rice with iron plaque decreased the pectin and hemicellulose 1 and hemicellulose 2 contents in the rice root tips, which further reduced the accumulation of Al in the root tip. In summary, the results indicate that phosphorus addition can help alleviate the effect of IP on Al toxicity in root tips, and the results provide a technical basis for improving the cell wall Al tolerance by phosphorus incorporation. |
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